One half-life: 5 grams
Two half-lives: 2.5 grams
Answer:
Metals conduct electricity because they have free Electrons in them which helps the current to move eaisily
Answer:
Uranium-238 undergoes alpha decay to form Thorium-234 as daughter product.
Explanation:
Alpha decay is indicative of loss of the equivalents of a helium particle emission. The reaction equation for this reaction is shown below:
→ 
I hope this explanation is clear and explanatory.